1216501350 has 24 divisors (see below), whose sum is σ = 3016923720. Its totient is φ = 324400320.

The previous prime is 1216501343. The next prime is 1216501397. The reversal of 1216501350 is 531056121.

It is a self number, because there is not a number n which added to its sum of digits gives 1216501350.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4054855 + ... + 4055154.

It is an arithmetic number, because the mean of its divisors is an integer number (125705155).

Almost surely, 2^1216501350 is an apocalyptic number.

1216501350 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1216501350 is an abundant number, since it is smaller than the sum of its proper divisors (1800422370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1216501350 is a wasteful number, since it uses less digits than its factorization.

1216501350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8110024 (or 8110019 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 1216501350 is about 34878.3794061593. The cubic root of 1216501350 is about 1067.5073282774.

Adding to 1216501350 its reverse (531056121), we get a palindrome (1747557471).

The spelling of 1216501350 in words is "one billion, two hundred sixteen million, five hundred one thousand, three hundred fifty".